Zoltan Hudak / Mbed OS LCD_McuFriend_FSMC_STM32F407

3.5" inch TFT LCD Display Module 480X320 driven with FSMC.

TFT LCD Display Module 480X320 driven with FSMC

I have recently bought a 3.5" inch TFT LCD Touch Screen Display Module 480X320 with a www.mcufriend.com label on the back side. The display was equipped with an 8bit parallel interface. First I decided to test it with the UniGraphic library using the BUS_8 protocol. The display was very slow but improved when I switched to the PAR_8 protocol. Because I heard about the possibility to use a Flexible Static Memory Controller (FSMC), built into some STM MCU's, to drive LCD's (read/write to LCD's memory rather than to an external SRAM) I thought it would be a fun to try it out.

https://os.mbed.com/media/uploads/hudakz/lcd_3.5_tft_480x320_mcufriend_front.png

Below is the brief story of what I did:

  • Selected FSMC in the Connectivity category and configured it as below: https://os.mbed.com/media/uploads/hudakz/arch_max_fsmc_conf.png
  • Let the STM32CubeIDE generate the code (files).
  • Created a new program for the Seeed Arch Max target in the Mbed Online Compiler by selecting a mbed os blinky template.
  • Replaced the main.cpp with the main.c content of the STM32CubeIDE project.
  • Copy & Pasted the other files with codes from the STM32CubeIDE project to the online compiler project.
  • Renamed and modified:
    "stm32f4xx_it.h" to "stm32f4xx_it_msp.h"
    "stm32f4xx_it.c" to "stm32f4xx_it_msp.c"
  • Added the UniGraphic library to the online compiler project.
  • Extended the UniGraphic library with a FSMC_8 protocol and replaced the TFT::set_orientation(int orient) function with the one used by mcufriend for arduino.
  • Modified the main.cpp as needed.
https://os.mbed.com/media/uploads/hudakz/stm32f407vet6_st-link03.pnghttps://os.mbed.com/media/uploads/hudakz/lcd_3.5_tft_480x320_mcufriend_back.png


Wiring

STM32F407VETFT LCD module
+3.3V3V3
GNDGND
PB_12LCD_RST
GNDLCD_CS
PD_13 (RS)LCD_RS
PD_5 (WR)LCD_WR
PD_4 (RD)LCD_RD
PD_14 (DB00)LCD_D0
PD_15 (DB01)LCD_D1
PD_0 (DB02)LCD_D2
PD_1 (DB03)LCD_D3
PE_7 (DB04)LCD_D4
PE_8 (DB05)LCD_D5
PE_9 (DB06)LCD_D6
PE_10 (DB07)LCD_D7



Results
Execution times
Used protocolBUS_8FSMC_8
Operation \ Timemsms
Clear2283.98038.454
Plot192.06611.365
8bit BMP63.80541.338
Large Font163.8727.895
Sparce pixels2072.265/1458.05174.107/52.168
16bit BMP2288.58959.904

Diff: stm32f4xx_it_msp.c

Revision:
0:fa952828e34c
Child:
1:47c996032a9e
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stm32f4xx_it_msp.c	Sun May 10 10:44:31 2020 +0000
@@ -0,0 +1,204 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_it.c
+  * @brief   Interrupt Service Routines.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+#include "stm32f4xx_it_msp.h"
+/* Private includes ----------------------------------------------------------*/
+/* USER CODE BEGIN Includes */
+/* USER CODE END Includes */
+
+/* Private typedef -----------------------------------------------------------*/
+/* USER CODE BEGIN TD */
+
+/* USER CODE END TD */
+
+/* Private define ------------------------------------------------------------*/
+/* USER CODE BEGIN PD */
+ 
+/* USER CODE END PD */
+
+/* Private macro -------------------------------------------------------------*/
+/* USER CODE BEGIN PM */
+
+/* USER CODE END PM */
+
+/* Private variables ---------------------------------------------------------*/
+/* USER CODE BEGIN PV */
+
+/* USER CODE END PV */
+
+/* Private function prototypes -----------------------------------------------*/
+/* USER CODE BEGIN PFP */
+
+/* USER CODE END PFP */
+
+/* Private user code ---------------------------------------------------------*/
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+/* External variables --------------------------------------------------------*/
+
+/* USER CODE BEGIN EV */
+
+/* USER CODE END EV */
+
+/******************************************************************************/
+/*           Cortex-M4 Processor Interruption and Exception Handlers          */ 
+/******************************************************************************/
+/**
+  * @brief This function handles Non maskable interrupt.
+  */
+void NMI_Handler(void)
+{
+  /* USER CODE BEGIN NonMaskableInt_IRQn 0 */
+
+  /* USER CODE END NonMaskableInt_IRQn 0 */
+  /* USER CODE BEGIN NonMaskableInt_IRQn 1 */
+
+  /* USER CODE END NonMaskableInt_IRQn 1 */
+}
+
+/**
+  * @brief This function handles Hard fault interrupt.
+  */
+//void HardFault_Handler(void)
+//{
+//  /* USER CODE BEGIN HardFault_IRQn 0 */
+
+//  /* USER CODE END HardFault_IRQn 0 */
+//  while (1)
+//  {
+//    /* USER CODE BEGIN W1_HardFault_IRQn 0 */
+//    /* USER CODE END W1_HardFault_IRQn 0 */
+//  }
+//}
+
+/**
+  * @brief This function handles Memory management fault.
+  */
+//void MemManage_Handler(void)
+//{
+//  /* USER CODE BEGIN MemoryManagement_IRQn 0 */
+
+//  /* USER CODE END MemoryManagement_IRQn 0 */
+//  while (1)
+//  {
+//    /* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
+//    /* USER CODE END W1_MemoryManagement_IRQn 0 */
+//  }
+//}
+
+/**
+  * @brief This function handles Pre-fetch fault, memory access fault.
+  */
+//void BusFault_Handler(void)
+//{
+//  /* USER CODE BEGIN BusFault_IRQn 0 */
+
+//  /* USER CODE END BusFault_IRQn 0 */
+//  while (1)
+//  {
+//    /* USER CODE BEGIN W1_BusFault_IRQn 0 */
+//    /* USER CODE END W1_BusFault_IRQn 0 */
+//  }
+//}
+
+/**
+  * @brief This function handles Undefined instruction or illegal state.
+  */
+//void UsageFault_Handler(void)
+//{
+//  /* USER CODE BEGIN UsageFault_IRQn 0 */
+
+//  /* USER CODE END UsageFault_IRQn 0 */
+//  while (1)
+//  {
+//    /* USER CODE BEGIN W1_UsageFault_IRQn 0 */
+//    /* USER CODE END W1_UsageFault_IRQn 0 */
+//  }
+//}
+
+/**
+  * @brief This function handles System service call via SWI instruction.
+  */
+//void SVC_Handler(void)
+//{
+//  /* USER CODE BEGIN SVCall_IRQn 0 */
+
+//  /* USER CODE END SVCall_IRQn 0 */
+//  /* USER CODE BEGIN SVCall_IRQn 1 */
+
+//  /* USER CODE END SVCall_IRQn 1 */
+//}
+
+/**
+  * @brief This function handles Debug monitor.
+  */
+//void DebugMon_Handler(void)
+//{
+//  /* USER CODE BEGIN DebugMonitor_IRQn 0 */
+
+//  /* USER CODE END DebugMonitor_IRQn 0 */
+//  /* USER CODE BEGIN DebugMonitor_IRQn 1 */
+
+//  /* USER CODE END DebugMonitor_IRQn 1 */
+//}
+
+/**
+  * @brief This function handles Pendable request for system service.
+  */
+//void PendSV_Handler(void)
+//{
+//  /* USER CODE BEGIN PendSV_IRQn 0 */
+
+//  /* USER CODE END PendSV_IRQn 0 */
+//  /* USER CODE BEGIN PendSV_IRQn 1 */
+
+//  /* USER CODE END PendSV_IRQn 1 */
+//}
+
+/**
+  * @brief This function handles System tick timer.
+  */
+//void SysTick_Handler(void)
+//{
+//  /* USER CODE BEGIN SysTick_IRQn 0 */
+
+//  /* USER CODE END SysTick_IRQn 0 */
+//  HAL_IncTick();
+//  /* USER CODE BEGIN SysTick_IRQn 1 */
+
+//  /* USER CODE END SysTick_IRQn 1 */
+//}
+
+/******************************************************************************/
+/* STM32F4xx Peripheral Interrupt Handlers                                    */
+/* Add here the Interrupt Handlers for the used peripherals.                  */
+/* For the available peripheral interrupt handler names,                      */
+/* please refer to the startup file (startup_stm32f4xx.s).                    */
+/******************************************************************************/
+
+/* USER CODE BEGIN 1 */
+
+/* USER CODE END 1 */
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+